Abstract
The effect of the friction between the drill string and the borehole on the drill string buckling behavior has not been fully understood. First, we treated the friction between the drill string and the borehole as the orthotropic friction, and established a finite element (FE) model of the drill string and the borehole system. Then, the comparison with the experimental results shows that the FE model has a high accuracy. Finally, the effect of the orthotropic friction on the buckling behavior of the drill string was analyzed. Results demonstrate that the orthotropic friction can impact the buckling behavior, such as the critical buckling forces, the bending moment, the friction force and the axial force transfer. Simplifying the friction between the drill string and the borehole as the unidirectional or the isotropic friction cannot accurately predict the buckling behavior. The results can complement the existing theoretical models and provide guidance for field operations.DOI: http://dx.doi.org/10.5755/j01.mech.24.3.18363
Highlights
Buckling is an important issue in oil and gas industry [1]
Miller et al [9], based on the finite element method, researched the buckling behavior of the Kirchhoff rod constrained in a horizontal pipe under the influence of the isotropic friction
In order to examine the influence of the orthotropic friction on the buckling behavior of the horizontal drill string, we conduct the simulation in two cases (Case1: μτ1 varies from 0.1 to 0.4 and μτ2=0.3; Case 2: μτ1=0.3 and μτ2 varies from 0.1 to 0.4), respectively
Summary
Buckling is an important issue in oil and gas industry [1]. The drill string can buckle into a sinusoidal or helical buckling configuration under the co-action of the gravity, bending moment, contact force as well as friction between the drill string and borehole. In the context of the non-conservative system, in 2006, Gao Deli [5] obtained expressions for the sinusoidal and helical bucking force when the axial and tangential friction was considered. Gao and Miska [6,7] considered the effect of the tangential friction, and induced the formulations for the sinusoidal and helical buckling force. Hajianmaleki and Daily [8] studied the critical buckling and the axial force transfer issue using the finite element model established in Abaqus. Miller et al [9], based on the finite element method, researched the buckling behavior of the Kirchhoff rod constrained in a horizontal pipe under the influence of the isotropic friction. We examine the effect of the orthotropic friction on the buckling behavior of the drill string in sliding mode. The conclusions can complement the existing theoretical models and provide guidance for field operations
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